[clang] [llvm] [AArch64] Add intrinsics for SME FP8 FDOT LANE instructions (PR #118492)

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https://github.com/SpencerAbson commented:

Thank you, Jonathan! 

We would also want feature and immediate range tests - E.,g [Immediate argument tests](https://github.com/llvm/llvm-project/blob/e804d5f7cc459b9310122ed5405bba5c4d6a2350/clang/test/Sema/aarch64-fp8-intrinsics/acle_sme2_fp8_imm.c) and [feature requirement tests](https://github.com/llvm/llvm-project/blob/3a9643e6c2d61eae2e23df42c19b1410d4a5fcc5/clang/test/Sema/aarch64-sve2-intrinsics/acle_sve2_fp8.c).


https://github.com/llvm/llvm-project/pull/118492